IOS页面跳转之UINavigatioinController

       android里面的对页面（Activity）的前进和后退默认就是用堆栈的形式。启动一个新页面是startActivity,返回一个页面是finish。

       IOS里面如果想以堆栈的形式管理页面（ViewController）需要显示的使用UINavigationController来管理。没有UINavigationController时初始化首页ViewController的操作是这样的：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    ViewController01 *root = [[RootViewController01 alloc]init];     //首页ViewController
    self.window.rootViewController = root;
    [navController release];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

==================================================================================================

有UINavigationController时初始化首页ViewController的操作是这样的：

打开AppDelegate.h，向其中添加属性：

@property (strong, nonatomic) UINavigationController *navController;  

在AppDelegate.m 文件的didFinishLaunchingWithOptions方法中创建添加navController

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    ViewController01 *root = [[RootViewController01 alloc]init];     //首页ViewController
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:root];
    [root release];
    self.window.rootViewController = navController;
    [navController release];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}